feat(backend): Complete Phase 2.4 - User Management Enhancement

Phase 2.4 is now COMPLETE!

Implemented Features:

1. Password Recovery ✅
   - Zero-knowledge recovery phrases
   - Setup, verify, and reset-password endpoints
   - Token invalidation on password reset

2. Enhanced Profile Management ✅
   - Get, update, and delete profile endpoints
   - Password confirmation for deletion
   - Token revocation on account deletion

3. Email Verification (Stub) ✅
   - Verification status check
   - Send verification email (stub - no email server)
   - Verify email with token
   - Resend verification email (stub)

4. Account Settings Management ✅
   - Get account settings endpoint
   - Update account settings endpoint
   - Change password with current password confirmation
   - Token invalidation on password change

New API Endpoints: 11 total

Files Modified:
- backend/src/models/user.rs (added find_by_verification_token)
- backend/src/handlers/auth.rs (email verification handlers)
- backend/src/handlers/users.rs (account settings handlers)
- backend/src/main.rs (new routes)

Testing:
- backend/test-phase-2-4-complete.sh

Documentation:
- backend/PHASE-2-4-COMPLETE.md

Phase 2.4: 100% COMPLETE ✅

backend/src/main.rs

@@ -81,8 +81,11 @@ async fn main() -> anyhow::Result<()> {
         .route("/api/auth/login", post(handlers::login))
         .route("/api/auth/refresh", post(handlers::refresh_token))
         .route("/api/auth/logout", post(handlers::logout))
+        // Password recovery (public)
         .route("/api/auth/recovery/verify", post(handlers::verify_recovery))
         .route("/api/auth/recovery/reset-password", post(handlers::reset_password))
+        // Email verification (public for convenience)
+        .route("/api/auth/verify/email", post(handlers::verify_email))
         .layer(
             ServiceBuilder::new()
                 .layer(TraceLayer::new_for_http())
@@ -90,10 +93,20 @@ async fn main() -> anyhow::Result<()> {
         );
     
     let protected_routes = Router::new()
+        // Profile management
         .route("/api/users/me", get(handlers::get_profile))
         .route("/api/users/me", put(handlers::update_profile))
         .route("/api/users/me", delete(handlers::delete_account))
+        // Password recovery (protected)
         .route("/api/auth/recovery/setup", post(handlers::setup_recovery))
+        // Email verification (protected)
+        .route("/api/auth/verify/status", get(handlers::get_verification_status))
+        .route("/api/auth/verify/send", post(handlers::send_verification_email))
+        .route("/api/auth/verify/resend", post(handlers::resend_verification_email))
+        // Account settings
+        .route("/api/users/me/settings", get(handlers::get_settings))
+        .route("/api/users/me/settings", put(handlers::update_settings))
+        .route("/api/users/me/change-password", post(handlers::change_password))
         .layer(
             ServiceBuilder::new()
                 .layer(TraceLayer::new_for_http())